    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <!-- 
        语义化标签
        增强型表单
        canvas svg
        音频视频
        本地存储和离线存储
     -->
     <input type="text" value='1223'>
     <ul>
        <li>1111
        <li>2222
        <li>3333
     </ul>
